net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/rculist.h>
  22 #include <linux/rculist_nulls.h>
  23 #include <linux/types.h>
  24 #include <linux/timer.h>
  25 #include <linux/security.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/errno.h>
  28 #include <linux/netlink.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/slab.h>
  32 #include <linux/siphash.h>
  33
  34 #include <linux/netfilter.h>
  35 #include <net/netlink.h>
  36 #include <net/sock.h>
  37 #include <net/netfilter/nf_conntrack.h>
  38 #include <net/netfilter/nf_conntrack_core.h>
  39 #include <net/netfilter/nf_conntrack_expect.h>
  40 #include <net/netfilter/nf_conntrack_helper.h>
  41 #include <net/netfilter/nf_conntrack_seqadj.h>
  42 #include <net/netfilter/nf_conntrack_l4proto.h>
  43 #include <net/netfilter/nf_conntrack_tuple.h>
  44 #include <net/netfilter/nf_conntrack_acct.h>
  45 #include <net/netfilter/nf_conntrack_zones.h>
  46 #include <net/netfilter/nf_conntrack_timestamp.h>
  47 #include <net/netfilter/nf_conntrack_labels.h>
  48 #include <net/netfilter/nf_conntrack_synproxy.h>
  49 #ifdef CONFIG_NF_NAT_NEEDED
  50 #include <net/netfilter/nf_nat_core.h>
  51 #include <net/netfilter/nf_nat_l4proto.h>
  52 #include <net/netfilter/nf_nat_helper.h>
  53 #endif
  54
  55 #include <linux/netfilter/nfnetlink.h>
  56 #include <linux/netfilter/nfnetlink_conntrack.h>
  57
  58 MODULE_LICENSE("GPL");
  59
  60 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  61                                 const struct nf_conntrack_tuple *tuple,
  62                                 const struct nf_conntrack_l4proto *l4proto)
  63 {
  64         int ret = 0;
  65         struct nlattr *nest_parms;
  66
  67         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  68         if (!nest_parms)
  69                 goto nla_put_failure;
  70         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  71                 goto nla_put_failure;
  72
  73         if (likely(l4proto->tuple_to_nlattr))
  74                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  75
  76         nla_nest_end(skb, nest_parms);
  77
  78         return ret;
  79
  80 nla_put_failure:
  81         return -1;
  82 }
  83
  84 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
  85                                 const struct nf_conntrack_tuple *tuple)
  86 {
  87         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
  88             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
  89                 return -EMSGSIZE;
  90         return 0;
  91 }
  92
  93 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
  94                                 const struct nf_conntrack_tuple *tuple)
  95 {
  96         if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
  97             nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
  98                 return -EMSGSIZE;
  99         return 0;
 100 }
 101
 102 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 103                                     const struct nf_conntrack_tuple *tuple)
 104 {
 105         int ret = 0;
 106         struct nlattr *nest_parms;
 107
 108         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
 109         if (!nest_parms)
 110                 goto nla_put_failure;
 111
 112         switch (tuple->src.l3num) {
 113         case NFPROTO_IPV4:
 114                 ret = ipv4_tuple_to_nlattr(skb, tuple);
 115                 break;
 116         case NFPROTO_IPV6:
 117                 ret = ipv6_tuple_to_nlattr(skb, tuple);
 118                 break;
 119         }
 120
 121         nla_nest_end(skb, nest_parms);
 122
 123         return ret;
 124
 125 nla_put_failure:
 126         return -1;
 127 }
 128
 129 static int ctnetlink_dump_tuples(struct sk_buff *skb,
 130                                  const struct nf_conntrack_tuple *tuple)
 131 {
 132         const struct nf_conntrack_l4proto *l4proto;
 133         int ret;
 134
 135         rcu_read_lock();
 136         ret = ctnetlink_dump_tuples_ip(skb, tuple);
 137
 138         if (ret >= 0) {
 139                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
 140                                                tuple->dst.protonum);
 141                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 142         }
 143         rcu_read_unlock();
 144         return ret;
 145 }
 146
 147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
 148                                   const struct nf_conntrack_zone *zone, int dir)
 149 {
 150         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
 151                 return 0;
 152         if (nla_put_be16(skb, attrtype, htons(zone->id)))
 153                 goto nla_put_failure;
 154         return 0;
 155
 156 nla_put_failure:
 157         return -1;
 158 }
 159
 160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 161 {
 162         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 163                 goto nla_put_failure;
 164         return 0;
 165
 166 nla_put_failure:
 167         return -1;
 168 }
 169
 170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 171 {
 172         long timeout = nf_ct_expires(ct) / HZ;
 173
 174         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 175                 goto nla_put_failure;
 176         return 0;
 177
 178 nla_put_failure:
 179         return -1;
 180 }
 181
 182 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 183 {
 184         const struct nf_conntrack_l4proto *l4proto;
 185         struct nlattr *nest_proto;
 186         int ret;
 187
 188         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 189         if (!l4proto->to_nlattr)
 190                 return 0;
 191
 192         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 193         if (!nest_proto)
 194                 goto nla_put_failure;
 195
 196         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 197
 198         nla_nest_end(skb, nest_proto);
 199
 200         return ret;
 201
 202 nla_put_failure:
 203         return -1;
 204 }
 205
 206 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
 207                                    const struct nf_conn *ct)
 208 {
 209         struct nlattr *nest_helper;
 210         const struct nf_conn_help *help = nfct_help(ct);
 211         struct nf_conntrack_helper *helper;
 212
 213         if (!help)
 214                 return 0;
 215
 216         rcu_read_lock();
 217         helper = rcu_dereference(help->helper);
 218         if (!helper)
 219                 goto out;
 220
 221         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 222         if (!nest_helper)
 223                 goto nla_put_failure;
 224         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 225                 goto nla_put_failure;
 226
 227         if (helper->to_nlattr)
 228                 helper->to_nlattr(skb, ct);
 229
 230         nla_nest_end(skb, nest_helper);
 231 out:
 232         rcu_read_unlock();
 233         return 0;
 234
 235 nla_put_failure:
 236         rcu_read_unlock();
 237         return -1;
 238 }
 239
 240 static int
 241 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
 242               enum ip_conntrack_dir dir, int type)
 243 {
 244         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 245         struct nf_conn_counter *counter = acct->counter;
 246         struct nlattr *nest_count;
 247         u64 pkts, bytes;
 248
 249         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 250                 pkts = atomic64_xchg(&counter[dir].packets, 0);
 251                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
 252         } else {
 253                 pkts = atomic64_read(&counter[dir].packets);
 254                 bytes = atomic64_read(&counter[dir].bytes);
 255         }
 256
 257         nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
 258         if (!nest_count)
 259                 goto nla_put_failure;
 260
 261         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
 262                          CTA_COUNTERS_PAD) ||
 263             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
 264                          CTA_COUNTERS_PAD))
 265                 goto nla_put_failure;
 266
 267         nla_nest_end(skb, nest_count);
 268
 269         return 0;
 270
 271 nla_put_failure:
 272         return -1;
 273 }
 274
 275 static int
 276 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
 277 {
 278         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
 279
 280         if (!acct)
 281                 return 0;
 282
 283         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
 284                 return -1;
 285         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
 286                 return -1;
 287
 288         return 0;
 289 }
 290
 291 static int
 292 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 293 {
 294         struct nlattr *nest_count;
 295         const struct nf_conn_tstamp *tstamp;
 296
 297         tstamp = nf_conn_tstamp_find(ct);
 298         if (!tstamp)
 299                 return 0;
 300
 301         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 302         if (!nest_count)
 303                 goto nla_put_failure;
 304
 305         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
 306                          CTA_TIMESTAMP_PAD) ||
 307             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 308                                                cpu_to_be64(tstamp->stop),
 309                                                CTA_TIMESTAMP_PAD)))
 310                 goto nla_put_failure;
 311         nla_nest_end(skb, nest_count);
 312
 313         return 0;
 314
 315 nla_put_failure:
 316         return -1;
 317 }
 318
 319 #ifdef CONFIG_NF_CONNTRACK_MARK
 320 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 321 {
 322         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 323                 goto nla_put_failure;
 324         return 0;
 325
 326 nla_put_failure:
 327         return -1;
 328 }
 329 #else
 330 #define ctnetlink_dump_mark(a, b) (0)
 331 #endif
 332
 333 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 334 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 335 {
 336         struct nlattr *nest_secctx;
 337         int len, ret;
 338         char *secctx;
 339
 340         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 341         if (ret)
 342                 return 0;
 343
 344         ret = -1;
 345         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 346         if (!nest_secctx)
 347                 goto nla_put_failure;
 348
 349         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 350                 goto nla_put_failure;
 351         nla_nest_end(skb, nest_secctx);
 352
 353         ret = 0;
 354 nla_put_failure:
 355         security_release_secctx(secctx, len);
 356         return ret;
 357 }
 358 #else
 359 #define ctnetlink_dump_secctx(a, b) (0)
 360 #endif
 361
 362 #ifdef CONFIG_NF_CONNTRACK_LABELS
 363 static inline int ctnetlink_label_size(const struct nf_conn *ct)
 364 {
 365         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 366
 367         if (!labels)
 368                 return 0;
 369         return nla_total_size(sizeof(labels->bits));
 370 }
 371
 372 static int
 373 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 374 {
 375         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 376         unsigned int i;
 377
 378         if (!labels)
 379                 return 0;
 380
 381         i = 0;
 382         do {
 383                 if (labels->bits[i] != 0)
 384                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
 385                                        labels->bits);
 386                 i++;
 387         } while (i < ARRAY_SIZE(labels->bits));
 388
 389         return 0;
 390 }
 391 #else
 392 #define ctnetlink_dump_labels(a, b) (0)
 393 #define ctnetlink_label_size(a) (0)
 394 #endif
 395
 396 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 397
 398 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 399 {
 400         struct nlattr *nest_parms;
 401
 402         if (!(ct->status & IPS_EXPECTED))
 403                 return 0;
 404
 405         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 406         if (!nest_parms)
 407                 goto nla_put_failure;
 408         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 409                 goto nla_put_failure;
 410         nla_nest_end(skb, nest_parms);
 411
 412         return 0;
 413
 414 nla_put_failure:
 415         return -1;
 416 }
 417
 418 static int
 419 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
 420 {
 421         struct nlattr *nest_parms;
 422
 423         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 424         if (!nest_parms)
 425                 goto nla_put_failure;
 426
 427         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
 428                          htonl(seq->correction_pos)) ||
 429             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
 430                          htonl(seq->offset_before)) ||
 431             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
 432                          htonl(seq->offset_after)))
 433                 goto nla_put_failure;
 434
 435         nla_nest_end(skb, nest_parms);
 436
 437         return 0;
 438
 439 nla_put_failure:
 440         return -1;
 441 }
 442
 443 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
 444 {
 445         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
 446         struct nf_ct_seqadj *seq;
 447
 448         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
 449                 return 0;
 450
 451         spin_lock_bh(&ct->lock);
 452         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
 453         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
 454                 goto err;
 455
 456         seq = &seqadj->seq[IP_CT_DIR_REPLY];
 457         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
 458                 goto err;
 459
 460         spin_unlock_bh(&ct->lock);
 461         return 0;
 462 err:
 463         spin_unlock_bh(&ct->lock);
 464         return -1;
 465 }
 466
 467 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
 468 {
 469         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
 470         struct nlattr *nest_parms;
 471
 472         if (!synproxy)
 473                 return 0;
 474
 475         nest_parms = nla_nest_start(skb, CTA_SYNPROXY | NLA_F_NESTED);
 476         if (!nest_parms)
 477                 goto nla_put_failure;
 478
 479         if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
 480             nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
 481             nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
 482                 goto nla_put_failure;
 483
 484         nla_nest_end(skb, nest_parms);
 485
 486         return 0;
 487
 488 nla_put_failure:
 489         return -1;
 490 }
 491
 492 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 493 {
 494         __be32 id = (__force __be32)nf_ct_get_id(ct);
 495
 496         if (nla_put_be32(skb, CTA_ID, id))
 497                 goto nla_put_failure;
 498         return 0;
 499
 500 nla_put_failure:
 501         return -1;
 502 }
 503
 504 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 505 {
 506         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 507                 goto nla_put_failure;
 508         return 0;
 509
 510 nla_put_failure:
 511         return -1;
 512 }
 513
 514 static int
 515 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 516                     struct nf_conn *ct)
 517 {
 518         const struct nf_conntrack_zone *zone;
 519         struct nlmsghdr *nlh;
 520         struct nfgenmsg *nfmsg;
 521         struct nlattr *nest_parms;
 522         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
 523
 524         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
 525         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
 526         if (nlh == NULL)
 527                 goto nlmsg_failure;
 528
 529         nfmsg = nlmsg_data(nlh);
 530         nfmsg->nfgen_family = nf_ct_l3num(ct);
 531         nfmsg->version      = NFNETLINK_V0;
 532         nfmsg->res_id       = 0;
 533
 534         zone = nf_ct_zone(ct);
 535
 536         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 537         if (!nest_parms)
 538                 goto nla_put_failure;
 539         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 540                 goto nla_put_failure;
 541         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 542                                    NF_CT_ZONE_DIR_ORIG) < 0)
 543                 goto nla_put_failure;
 544         nla_nest_end(skb, nest_parms);
 545
 546         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 547         if (!nest_parms)
 548                 goto nla_put_failure;
 549         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 550                 goto nla_put_failure;
 551         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 552                                    NF_CT_ZONE_DIR_REPL) < 0)
 553                 goto nla_put_failure;
 554         nla_nest_end(skb, nest_parms);
 555
 556         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 557                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 558                 goto nla_put_failure;
 559
 560         if (ctnetlink_dump_status(skb, ct) < 0 ||
 561             ctnetlink_dump_acct(skb, ct, type) < 0 ||
 562             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 563             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 564             ctnetlink_dump_mark(skb, ct) < 0 ||
 565             ctnetlink_dump_secctx(skb, ct) < 0 ||
 566             ctnetlink_dump_labels(skb, ct) < 0 ||
 567             ctnetlink_dump_id(skb, ct) < 0 ||
 568             ctnetlink_dump_use(skb, ct) < 0 ||
 569             ctnetlink_dump_master(skb, ct) < 0 ||
 570             ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
 571             ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 572                 goto nla_put_failure;
 573
 574         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
 575             (ctnetlink_dump_timeout(skb, ct) < 0 ||
 576              ctnetlink_dump_protoinfo(skb, ct) < 0))
 577                 goto nla_put_failure;
 578
 579         nlmsg_end(skb, nlh);
 580         return skb->len;
 581
 582 nlmsg_failure:
 583 nla_put_failure:
 584         nlmsg_cancel(skb, nlh);
 585         return -1;
 586 }
 587
 588 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
 589         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
 590         [CTA_IP_V4_DST] = { .type = NLA_U32 },
 591         [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
 592         [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
 593 };
 594
 595 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
 596 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
 597 {
 598         const struct nf_conntrack_l4proto *l4proto;
 599         size_t len, len4 = 0;
 600
 601         len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
 602         len *= 3u; /* ORIG, REPLY, MASTER */
 603
 604         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 605         len += l4proto->nlattr_size;
 606         if (l4proto->nlattr_tuple_size) {
 607                 len4 = l4proto->nlattr_tuple_size();
 608                 len4 *= 3u; /* ORIG, REPLY, MASTER */
 609         }
 610
 611         return len + len4;
 612 }
 613 #endif
 614
 615 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
 616 {
 617         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 618                 return 0;
 619         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 620                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 621                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 622                ;
 623 }
 624
 625 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
 626 {
 627 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 628         int len, ret;
 629
 630         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 631         if (ret)
 632                 return 0;
 633
 634         return nla_total_size(0) /* CTA_SECCTX */
 635                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 636 #else
 637         return 0;
 638 #endif
 639 }
 640
 641 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
 642 {
 643 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 644         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 645                 return 0;
 646         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
 647 #else
 648         return 0;
 649 #endif
 650 }
 651
 652 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 653 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
 654 {
 655         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 656                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 657                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 658                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 659                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 660                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 661                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 662                + ctnetlink_acct_size(ct)
 663                + ctnetlink_timestamp_size(ct)
 664                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 665                + nla_total_size(0) /* CTA_PROTOINFO */
 666                + nla_total_size(0) /* CTA_HELP */
 667                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 668                + ctnetlink_secctx_size(ct)
 669 #ifdef CONFIG_NF_NAT_NEEDED
 670                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 671                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 672 #endif
 673 #ifdef CONFIG_NF_CONNTRACK_MARK
 674                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 675 #endif
 676 #ifdef CONFIG_NF_CONNTRACK_ZONES
 677                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
 678 #endif
 679                + ctnetlink_proto_size(ct)
 680                + ctnetlink_label_size(ct)
 681                ;
 682 }
 683
 684 static int
 685 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 686 {
 687         const struct nf_conntrack_zone *zone;
 688         struct net *net;
 689         struct nlmsghdr *nlh;
 690         struct nfgenmsg *nfmsg;
 691         struct nlattr *nest_parms;
 692         struct nf_conn *ct = item->ct;
 693         struct sk_buff *skb;
 694         unsigned int type;
 695         unsigned int flags = 0, group;
 696         int err;
 697
 698         if (events & (1 << IPCT_DESTROY)) {
 699                 type = IPCTNL_MSG_CT_DELETE;
 700                 group = NFNLGRP_CONNTRACK_DESTROY;
 701         } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 702                 type = IPCTNL_MSG_CT_NEW;
 703                 flags = NLM_F_CREATE|NLM_F_EXCL;
 704                 group = NFNLGRP_CONNTRACK_NEW;
 705         } else if (events) {
 706                 type = IPCTNL_MSG_CT_NEW;
 707                 group = NFNLGRP_CONNTRACK_UPDATE;
 708         } else
 709                 return 0;
 710
 711         net = nf_ct_net(ct);
 712         if (!item->report && !nfnetlink_has_listeners(net, group))
 713                 return 0;
 714
 715         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 716         if (skb == NULL)
 717                 goto errout;
 718
 719         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
 720         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
 721         if (nlh == NULL)
 722                 goto nlmsg_failure;
 723
 724         nfmsg = nlmsg_data(nlh);
 725         nfmsg->nfgen_family = nf_ct_l3num(ct);
 726         nfmsg->version  = NFNETLINK_V0;
 727         nfmsg->res_id   = 0;
 728
 729         zone = nf_ct_zone(ct);
 730
 731         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 732         if (!nest_parms)
 733                 goto nla_put_failure;
 734         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 735                 goto nla_put_failure;
 736         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 737                                    NF_CT_ZONE_DIR_ORIG) < 0)
 738                 goto nla_put_failure;
 739         nla_nest_end(skb, nest_parms);
 740
 741         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 742         if (!nest_parms)
 743                 goto nla_put_failure;
 744         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 745                 goto nla_put_failure;
 746         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 747                                    NF_CT_ZONE_DIR_REPL) < 0)
 748                 goto nla_put_failure;
 749         nla_nest_end(skb, nest_parms);
 750
 751         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 752                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 753                 goto nla_put_failure;
 754
 755         if (ctnetlink_dump_id(skb, ct) < 0)
 756                 goto nla_put_failure;
 757
 758         if (ctnetlink_dump_status(skb, ct) < 0)
 759                 goto nla_put_failure;
 760
 761         if (events & (1 << IPCT_DESTROY)) {
 762                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 763                     ctnetlink_dump_timestamp(skb, ct) < 0)
 764                         goto nla_put_failure;
 765         } else {
 766                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 767                         goto nla_put_failure;
 768
 769                 if (events & (1 << IPCT_PROTOINFO)
 770                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 771                         goto nla_put_failure;
 772
 773                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 774                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 775                         goto nla_put_failure;
 776
 777 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 778                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 779                     && ctnetlink_dump_secctx(skb, ct) < 0)
 780                         goto nla_put_failure;
 781 #endif
 782                 if (events & (1 << IPCT_LABEL) &&
 783                      ctnetlink_dump_labels(skb, ct) < 0)
 784                         goto nla_put_failure;
 785
 786                 if (events & (1 << IPCT_RELATED) &&
 787                     ctnetlink_dump_master(skb, ct) < 0)
 788                         goto nla_put_failure;
 789
 790                 if (events & (1 << IPCT_SEQADJ) &&
 791                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 792                         goto nla_put_failure;
 793
 794                 if (events & (1 << IPCT_SYNPROXY) &&
 795                     ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 796                         goto nla_put_failure;
 797         }
 798
 799 #ifdef CONFIG_NF_CONNTRACK_MARK
 800         if ((events & (1 << IPCT_MARK) || ct->mark)
 801             && ctnetlink_dump_mark(skb, ct) < 0)
 802                 goto nla_put_failure;
 803 #endif
 804         nlmsg_end(skb, nlh);
 805         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 806                              GFP_ATOMIC);
 807         if (err == -ENOBUFS || err == -EAGAIN)
 808                 return -ENOBUFS;
 809
 810         return 0;
 811
 812 nla_put_failure:
 813         nlmsg_cancel(skb, nlh);
 814 nlmsg_failure:
 815         kfree_skb(skb);
 816 errout:
 817         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 818                 return -ENOBUFS;
 819
 820         return 0;
 821 }
 822 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 823
 824 static int ctnetlink_done(struct netlink_callback *cb)
 825 {
 826         if (cb->args[1])
 827                 nf_ct_put((struct nf_conn *)cb->args[1]);
 828         kfree(cb->data);
 829         return 0;
 830 }
 831
 832 struct ctnetlink_filter {
 833         struct {
 834                 u_int32_t val;
 835                 u_int32_t mask;
 836         } mark;
 837 };
 838
 839 static struct ctnetlink_filter *
 840 ctnetlink_alloc_filter(const struct nlattr * const cda[])
 841 {
 842 #ifdef CONFIG_NF_CONNTRACK_MARK
 843         struct ctnetlink_filter *filter;
 844
 845         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
 846         if (filter == NULL)
 847                 return ERR_PTR(-ENOMEM);
 848
 849         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
 850         filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
 851
 852         return filter;
 853 #else
 854         return ERR_PTR(-EOPNOTSUPP);
 855 #endif
 856 }
 857
 858 static int ctnetlink_start(struct netlink_callback *cb)
 859 {
 860         const struct nlattr * const *cda = cb->data;
 861         struct ctnetlink_filter *filter = NULL;
 862
 863         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
 864                 filter = ctnetlink_alloc_filter(cda);
 865                 if (IS_ERR(filter))
 866                         return PTR_ERR(filter);
 867         }
 868
 869         cb->data = filter;
 870         return 0;
 871 }
 872
 873 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
 874 {
 875         struct ctnetlink_filter *filter = data;
 876
 877         if (filter == NULL)
 878                 return 1;
 879
 880 #ifdef CONFIG_NF_CONNTRACK_MARK
 881         if ((ct->mark & filter->mark.mask) == filter->mark.val)
 882                 return 1;
 883 #endif
 884
 885         return 0;
 886 }
 887
 888 static int
 889 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 890 {
 891         struct net *net = sock_net(skb->sk);
 892         struct nf_conn *ct, *last;
 893         struct nf_conntrack_tuple_hash *h;
 894         struct hlist_nulls_node *n;
 895         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 896         u_int8_t l3proto = nfmsg->nfgen_family;
 897         struct nf_conn *nf_ct_evict[8];
 898         int res, i;
 899         spinlock_t *lockp;
 900
 901         last = (struct nf_conn *)cb->args[1];
 902         i = 0;
 903
 904         local_bh_disable();
 905         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 906 restart:
 907                 while (i) {
 908                         i--;
 909                         if (nf_ct_should_gc(nf_ct_evict[i]))
 910                                 nf_ct_kill(nf_ct_evict[i]);
 911                         nf_ct_put(nf_ct_evict[i]);
 912                 }
 913
 914                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
 915                 nf_conntrack_lock(lockp);
 916                 if (cb->args[0] >= nf_conntrack_htable_size) {
 917                         spin_unlock(lockp);
 918                         goto out;
 919                 }
 920                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
 921                                            hnnode) {
 922                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 923                                 continue;
 924                         ct = nf_ct_tuplehash_to_ctrack(h);
 925                         if (nf_ct_is_expired(ct)) {
 926                                 if (i < ARRAY_SIZE(nf_ct_evict) &&
 927                                     atomic_inc_not_zero(&ct->ct_general.use))
 928                                         nf_ct_evict[i++] = ct;
 929                                 continue;
 930                         }
 931
 932                         if (!net_eq(net, nf_ct_net(ct)))
 933                                 continue;
 934
 935                         /* Dump entries of a given L3 protocol number.
 936                          * If it is not specified, ie. l3proto == 0,
 937                          * then dump everything. */
 938                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 939                                 continue;
 940                         if (cb->args[1]) {
 941                                 if (ct != last)
 942                                         continue;
 943                                 cb->args[1] = 0;
 944                         }
 945                         if (!ctnetlink_filter_match(ct, cb->data))
 946                                 continue;
 947
 948                         rcu_read_lock();
 949                         res =
 950                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
 951                                             cb->nlh->nlmsg_seq,
 952                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 953                                             ct);
 954                         rcu_read_unlock();
 955                         if (res < 0) {
 956                                 nf_conntrack_get(&ct->ct_general);
 957                                 cb->args[1] = (unsigned long)ct;
 958                                 spin_unlock(lockp);
 959                                 goto out;
 960                         }
 961                 }
 962                 spin_unlock(lockp);
 963                 if (cb->args[1]) {
 964                         cb->args[1] = 0;
 965                         goto restart;
 966                 }
 967         }
 968 out:
 969         local_bh_enable();
 970         if (last) {
 971                 /* nf ct hash resize happened, now clear the leftover. */
 972                 if ((struct nf_conn *)cb->args[1] == last)
 973                         cb->args[1] = 0;
 974
 975                 nf_ct_put(last);
 976         }
 977
 978         while (i) {
 979                 i--;
 980                 if (nf_ct_should_gc(nf_ct_evict[i]))
 981                         nf_ct_kill(nf_ct_evict[i]);
 982                 nf_ct_put(nf_ct_evict[i]);
 983         }
 984
 985         return skb->len;
 986 }
 987
 988 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
 989                                 struct nf_conntrack_tuple *t)
 990 {
 991         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
 992                 return -EINVAL;
 993
 994         t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
 995         t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
 996
 997         return 0;
 998 }
 999
1000 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1001                                 struct nf_conntrack_tuple *t)
1002 {
1003         if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
1004                 return -EINVAL;
1005
1006         t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1007         t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1008
1009         return 0;
1010 }
1011
1012 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1013                                     struct nf_conntrack_tuple *tuple)
1014 {
1015         struct nlattr *tb[CTA_IP_MAX+1];
1016         int ret = 0;
1017
1018         ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
1019         if (ret < 0)
1020                 return ret;
1021
1022         ret = nla_validate_nested(attr, CTA_IP_MAX,
1023                                   cta_ip_nla_policy, NULL);
1024         if (ret)
1025                 return ret;
1026
1027         switch (tuple->src.l3num) {
1028         case NFPROTO_IPV4:
1029                 ret = ipv4_nlattr_to_tuple(tb, tuple);
1030                 break;
1031         case NFPROTO_IPV6:
1032                 ret = ipv6_nlattr_to_tuple(tb, tuple);
1033                 break;
1034         }
1035
1036         return ret;
1037 }
1038
1039 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1040         [CTA_PROTO_NUM] = { .type = NLA_U8 },
1041 };
1042
1043 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1044                                        struct nf_conntrack_tuple *tuple)
1045 {
1046         const struct nf_conntrack_l4proto *l4proto;
1047         struct nlattr *tb[CTA_PROTO_MAX+1];
1048         int ret = 0;
1049
1050         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
1051                                NULL);
1052         if (ret < 0)
1053                 return ret;
1054
1055         if (!tb[CTA_PROTO_NUM])
1056                 return -EINVAL;
1057         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1058
1059         rcu_read_lock();
1060         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1061
1062         if (likely(l4proto->nlattr_to_tuple)) {
1063                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
1064                                           l4proto->nla_policy, NULL);
1065                 if (ret == 0)
1066                         ret = l4proto->nlattr_to_tuple(tb, tuple);
1067         }
1068
1069         rcu_read_unlock();
1070
1071         return ret;
1072 }
1073
1074 static int
1075 ctnetlink_parse_zone(const struct nlattr *attr,
1076                      struct nf_conntrack_zone *zone)
1077 {
1078         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1079                         NF_CT_DEFAULT_ZONE_DIR, 0);
1080 #ifdef CONFIG_NF_CONNTRACK_ZONES
1081         if (attr)
1082                 zone->id = ntohs(nla_get_be16(attr));
1083 #else
1084         if (attr)
1085                 return -EOPNOTSUPP;
1086 #endif
1087         return 0;
1088 }
1089
1090 static int
1091 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1092                            struct nf_conntrack_zone *zone)
1093 {
1094         int ret;
1095
1096         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1097                 return -EINVAL;
1098
1099         ret = ctnetlink_parse_zone(attr, zone);
1100         if (ret < 0)
1101                 return ret;
1102
1103         if (type == CTA_TUPLE_REPLY)
1104                 zone->dir = NF_CT_ZONE_DIR_REPL;
1105         else
1106                 zone->dir = NF_CT_ZONE_DIR_ORIG;
1107
1108         return 0;
1109 }
1110
1111 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1112         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
1113         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
1114         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
1115 };
1116
1117 static int
1118 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1119                       struct nf_conntrack_tuple *tuple, u32 type,
1120                       u_int8_t l3num, struct nf_conntrack_zone *zone)
1121 {
1122         struct nlattr *tb[CTA_TUPLE_MAX+1];
1123         int err;
1124
1125         memset(tuple, 0, sizeof(*tuple));
1126
1127         err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
1128                                NULL);
1129         if (err < 0)
1130                 return err;
1131
1132         if (!tb[CTA_TUPLE_IP])
1133                 return -EINVAL;
1134
1135         if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1136                 return -EOPNOTSUPP;
1137         tuple->src.l3num = l3num;
1138
1139         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1140         if (err < 0)
1141                 return err;
1142
1143         if (!tb[CTA_TUPLE_PROTO])
1144                 return -EINVAL;
1145
1146         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1147         if (err < 0)
1148                 return err;
1149
1150         if (tb[CTA_TUPLE_ZONE]) {
1151                 if (!zone)
1152                         return -EINVAL;
1153
1154                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1155                                                  type, zone);
1156                 if (err < 0)
1157                         return err;
1158         }
1159
1160         /* orig and expect tuples get DIR_ORIGINAL */
1161         if (type == CTA_TUPLE_REPLY)
1162                 tuple->dst.dir = IP_CT_DIR_REPLY;
1163         else
1164                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1165
1166         return 0;
1167 }
1168
1169 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1170         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1171                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1172 };
1173
1174 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1175                                 struct nlattr **helpinfo)
1176 {
1177         int err;
1178         struct nlattr *tb[CTA_HELP_MAX+1];
1179
1180         err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy, NULL);
1181         if (err < 0)
1182                 return err;
1183
1184         if (!tb[CTA_HELP_NAME])
1185                 return -EINVAL;
1186
1187         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1188
1189         if (tb[CTA_HELP_INFO])
1190                 *helpinfo = tb[CTA_HELP_INFO];
1191
1192         return 0;
1193 }
1194
1195 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1196         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1197         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1198         [CTA_STATUS]            = { .type = NLA_U32 },
1199         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1200         [CTA_HELP]              = { .type = NLA_NESTED },
1201         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1202         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1203         [CTA_MARK]              = { .type = NLA_U32 },
1204         [CTA_ID]                = { .type = NLA_U32 },
1205         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1206         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1207         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1208         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1209         [CTA_ZONE]              = { .type = NLA_U16 },
1210         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1211         [CTA_LABELS]            = { .type = NLA_BINARY,
1212                                     .len = NF_CT_LABELS_MAX_SIZE },
1213         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1214                                     .len = NF_CT_LABELS_MAX_SIZE },
1215 };
1216
1217 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1218 {
1219         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1220                 return 0;
1221
1222         return ctnetlink_filter_match(ct, data);
1223 }
1224
1225 static int ctnetlink_flush_conntrack(struct net *net,
1226                                      const struct nlattr * const cda[],
1227                                      u32 portid, int report)
1228 {
1229         struct ctnetlink_filter *filter = NULL;
1230
1231         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1232                 filter = ctnetlink_alloc_filter(cda);
1233                 if (IS_ERR(filter))
1234                         return PTR_ERR(filter);
1235         }
1236
1237         nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1238                                   portid, report);
1239         kfree(filter);
1240
1241         return 0;
1242 }
1243
1244 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1245                                    struct sk_buff *skb,
1246                                    const struct nlmsghdr *nlh,
1247                                    const struct nlattr * const cda[],
1248                                    struct netlink_ext_ack *extack)
1249 {
1250         struct nf_conntrack_tuple_hash *h;
1251         struct nf_conntrack_tuple tuple;
1252         struct nf_conn *ct;
1253         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1254         u_int8_t u3 = nfmsg->nfgen_family;
1255         struct nf_conntrack_zone zone;
1256         int err;
1257
1258         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1259         if (err < 0)
1260                 return err;
1261
1262         if (cda[CTA_TUPLE_ORIG])
1263                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1264                                             u3, &zone);
1265         else if (cda[CTA_TUPLE_REPLY])
1266                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1267                                             u3, &zone);
1268         else {
1269                 return ctnetlink_flush_conntrack(net, cda,
1270                                                  NETLINK_CB(skb).portid,
1271                                                  nlmsg_report(nlh));
1272         }
1273
1274         if (err < 0)
1275                 return err;
1276
1277         h = nf_conntrack_find_get(net, &zone, &tuple);
1278         if (!h)
1279                 return -ENOENT;
1280
1281         ct = nf_ct_tuplehash_to_ctrack(h);
1282
1283         if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1284                 nf_ct_put(ct);
1285                 return -EBUSY;
1286         }
1287
1288         if (cda[CTA_ID]) {
1289                 __be32 id = nla_get_be32(cda[CTA_ID]);
1290
1291                 if (id != (__force __be32)nf_ct_get_id(ct)) {
1292                         nf_ct_put(ct);
1293                         return -ENOENT;
1294                 }
1295         }
1296
1297         nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1298         nf_ct_put(ct);
1299
1300         return 0;
1301 }
1302
1303 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1304                                    struct sk_buff *skb,
1305                                    const struct nlmsghdr *nlh,
1306                                    const struct nlattr * const cda[],
1307                                    struct netlink_ext_ack *extack)
1308 {
1309         struct nf_conntrack_tuple_hash *h;
1310         struct nf_conntrack_tuple tuple;
1311         struct nf_conn *ct;
1312         struct sk_buff *skb2 = NULL;
1313         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1314         u_int8_t u3 = nfmsg->nfgen_family;
1315         struct nf_conntrack_zone zone;
1316         int err;
1317
1318         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1319                 struct netlink_dump_control c = {
1320                         .start = ctnetlink_start,
1321                         .dump = ctnetlink_dump_table,
1322                         .done = ctnetlink_done,
1323                         .data = (void *)cda,
1324                 };
1325
1326                 return netlink_dump_start(ctnl, skb, nlh, &c);
1327         }
1328
1329         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1330         if (err < 0)
1331                 return err;
1332
1333         if (cda[CTA_TUPLE_ORIG])
1334                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1335                                             u3, &zone);
1336         else if (cda[CTA_TUPLE_REPLY])
1337                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1338                                             u3, &zone);
1339         else
1340                 return -EINVAL;
1341
1342         if (err < 0)
1343                 return err;
1344
1345         h = nf_conntrack_find_get(net, &zone, &tuple);
1346         if (!h)
1347                 return -ENOENT;
1348
1349         ct = nf_ct_tuplehash_to_ctrack(h);
1350
1351         err = -ENOMEM;
1352         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1353         if (skb2 == NULL) {
1354                 nf_ct_put(ct);
1355                 return -ENOMEM;
1356         }
1357
1358         rcu_read_lock();
1359         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1360                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1361         rcu_read_unlock();
1362         nf_ct_put(ct);
1363         if (err <= 0)
1364                 goto free;
1365
1366         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1367         if (err < 0)
1368                 goto out;
1369
1370         return 0;
1371
1372 free:
1373         kfree_skb(skb2);
1374 out:
1375         /* this avoids a loop in nfnetlink. */
1376         return err == -EAGAIN ? -ENOBUFS : err;
1377 }
1378
1379 static int ctnetlink_done_list(struct netlink_callback *cb)
1380 {
1381         if (cb->args[1])
1382                 nf_ct_put((struct nf_conn *)cb->args[1]);
1383         return 0;
1384 }
1385
1386 static int
1387 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1388 {
1389         struct nf_conn *ct, *last;
1390         struct nf_conntrack_tuple_hash *h;
1391         struct hlist_nulls_node *n;
1392         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1393         u_int8_t l3proto = nfmsg->nfgen_family;
1394         int res;
1395         int cpu;
1396         struct hlist_nulls_head *list;
1397         struct net *net = sock_net(skb->sk);
1398
1399         if (cb->args[2])
1400                 return 0;
1401
1402         last = (struct nf_conn *)cb->args[1];
1403
1404         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1405                 struct ct_pcpu *pcpu;
1406
1407                 if (!cpu_possible(cpu))
1408                         continue;
1409
1410                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1411                 spin_lock_bh(&pcpu->lock);
1412                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1413 restart:
1414                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1415                         ct = nf_ct_tuplehash_to_ctrack(h);
1416                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1417                                 continue;
1418                         if (cb->args[1]) {
1419                                 if (ct != last)
1420                                         continue;
1421                                 cb->args[1] = 0;
1422                         }
1423                         rcu_read_lock();
1424                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1425                                                   cb->nlh->nlmsg_seq,
1426                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1427                                                   ct);
1428                         rcu_read_unlock();
1429                         if (res < 0) {
1430                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1431                                         continue;
1432                                 cb->args[0] = cpu;
1433                                 cb->args[1] = (unsigned long)ct;
1434                                 spin_unlock_bh(&pcpu->lock);
1435                                 goto out;
1436                         }
1437                 }
1438                 if (cb->args[1]) {
1439                         cb->args[1] = 0;
1440                         goto restart;
1441                 }
1442                 spin_unlock_bh(&pcpu->lock);
1443         }
1444         cb->args[2] = 1;
1445 out:
1446         if (last)
1447                 nf_ct_put(last);
1448
1449         return skb->len;
1450 }
1451
1452 static int
1453 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1454 {
1455         return ctnetlink_dump_list(skb, cb, true);
1456 }
1457
1458 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1459                                   struct sk_buff *skb,
1460                                   const struct nlmsghdr *nlh,
1461                                   const struct nlattr * const cda[],
1462                                   struct netlink_ext_ack *extack)
1463 {
1464         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1465                 struct netlink_dump_control c = {
1466                         .dump = ctnetlink_dump_dying,
1467                         .done = ctnetlink_done_list,
1468                 };
1469                 return netlink_dump_start(ctnl, skb, nlh, &c);
1470         }
1471
1472         return -EOPNOTSUPP;
1473 }
1474
1475 static int
1476 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1477 {
1478         return ctnetlink_dump_list(skb, cb, false);
1479 }
1480
1481 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1482                                         struct sk_buff *skb,
1483                                         const struct nlmsghdr *nlh,
1484                                         const struct nlattr * const cda[],
1485                                         struct netlink_ext_ack *extack)
1486 {
1487         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1488                 struct netlink_dump_control c = {
1489                         .dump = ctnetlink_dump_unconfirmed,
1490                         .done = ctnetlink_done_list,
1491                 };
1492                 return netlink_dump_start(ctnl, skb, nlh, &c);
1493         }
1494
1495         return -EOPNOTSUPP;
1496 }
1497
1498 #ifdef CONFIG_NF_NAT_NEEDED
1499 static int
1500 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1501                           enum nf_nat_manip_type manip,
1502                           const struct nlattr *attr)
1503 {
1504         struct nf_nat_hook *nat_hook;
1505         int err;
1506
1507         nat_hook = rcu_dereference(nf_nat_hook);
1508         if (!nat_hook) {
1509 #ifdef CONFIG_MODULES
1510                 rcu_read_unlock();
1511                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1512                 if (request_module("nf-nat") < 0) {
1513                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1514                         rcu_read_lock();
1515                         return -EOPNOTSUPP;
1516                 }
1517                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1518                 rcu_read_lock();
1519                 nat_hook = rcu_dereference(nf_nat_hook);
1520                 if (nat_hook)
1521                         return -EAGAIN;
1522 #endif
1523                 return -EOPNOTSUPP;
1524         }
1525
1526         err = nat_hook->parse_nat_setup(ct, manip, attr);
1527         if (err == -EAGAIN) {
1528 #ifdef CONFIG_MODULES
1529                 rcu_read_unlock();
1530                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1531                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1532                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1533                         rcu_read_lock();
1534                         return -EOPNOTSUPP;
1535                 }
1536                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1537                 rcu_read_lock();
1538 #else
1539                 err = -EOPNOTSUPP;
1540 #endif
1541         }
1542         return err;
1543 }
1544 #endif
1545
1546 static void
1547 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1548                           unsigned long off)
1549 {
1550         unsigned int bit;
1551
1552         /* Ignore these unchangable bits */
1553         on &= ~IPS_UNCHANGEABLE_MASK;
1554         off &= ~IPS_UNCHANGEABLE_MASK;
1555
1556         for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1557                 if (on & (1 << bit))
1558                         set_bit(bit, &ct->status);
1559                 else if (off & (1 << bit))
1560                         clear_bit(bit, &ct->status);
1561         }
1562 }
1563
1564 static int
1565 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1566 {
1567         unsigned long d;
1568         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1569         d = ct->status ^ status;
1570
1571         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1572                 /* unchangeable */
1573                 return -EBUSY;
1574
1575         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1576                 /* SEEN_REPLY bit can only be set */
1577                 return -EBUSY;
1578
1579         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1580                 /* ASSURED bit can only be set */
1581                 return -EBUSY;
1582
1583         __ctnetlink_change_status(ct, status, 0);
1584         return 0;
1585 }
1586
1587 static int
1588 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1589 {
1590 #ifdef CONFIG_NF_NAT_NEEDED
1591         int ret;
1592
1593         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1594                 return 0;
1595
1596         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1597                                         cda[CTA_NAT_DST]);
1598         if (ret < 0)
1599                 return ret;
1600
1601         return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1602                                          cda[CTA_NAT_SRC]);
1603 #else
1604         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1605                 return 0;
1606         return -EOPNOTSUPP;
1607 #endif
1608 }
1609
1610 static int ctnetlink_change_helper(struct nf_conn *ct,
1611                                    const struct nlattr * const cda[])
1612 {
1613         struct nf_conntrack_helper *helper;
1614         struct nf_conn_help *help = nfct_help(ct);
1615         char *helpname = NULL;
1616         struct nlattr *helpinfo = NULL;
1617         int err;
1618
1619         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1620         if (err < 0)
1621                 return err;
1622
1623         /* don't change helper of sibling connections */
1624         if (ct->master) {
1625                 /* If we try to change the helper to the same thing twice,
1626                  * treat the second attempt as a no-op instead of returning
1627                  * an error.
1628                  */
1629                 err = -EBUSY;
1630                 if (help) {
1631                         rcu_read_lock();
1632                         helper = rcu_dereference(help->helper);
1633                         if (helper && !strcmp(helper->name, helpname))
1634                                 err = 0;
1635                         rcu_read_unlock();
1636                 }
1637
1638                 return err;
1639         }
1640
1641         if (!strcmp(helpname, "")) {
1642                 if (help && help->helper) {
1643                         /* we had a helper before ... */
1644                         nf_ct_remove_expectations(ct);
1645                         RCU_INIT_POINTER(help->helper, NULL);
1646                 }
1647
1648                 return 0;
1649         }
1650
1651         rcu_read_lock();
1652         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1653                                             nf_ct_protonum(ct));
1654         if (helper == NULL) {
1655                 rcu_read_unlock();
1656                 return -EOPNOTSUPP;
1657         }
1658
1659         if (help) {
1660                 if (help->helper == helper) {
1661                         /* update private helper data if allowed. */
1662                         if (helper->from_nlattr)
1663                                 helper->from_nlattr(helpinfo, ct);
1664                         err = 0;
1665                 } else
1666                         err = -EBUSY;
1667         } else {
1668                 /* we cannot set a helper for an existing conntrack */
1669                 err = -EOPNOTSUPP;
1670         }
1671
1672         rcu_read_unlock();
1673         return err;
1674 }
1675
1676 static int ctnetlink_change_timeout(struct nf_conn *ct,
1677                                     const struct nlattr * const cda[])
1678 {
1679         u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1680
1681         if (timeout > INT_MAX)
1682                 timeout = INT_MAX;
1683         ct->timeout = nfct_time_stamp + (u32)timeout;
1684
1685         if (test_bit(IPS_DYING_BIT, &ct->status))
1686                 return -ETIME;
1687
1688         return 0;
1689 }
1690
1691 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1692         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1693         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1694         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1695 };
1696
1697 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1698                                       const struct nlattr * const cda[])
1699 {
1700         const struct nlattr *attr = cda[CTA_PROTOINFO];
1701         const struct nf_conntrack_l4proto *l4proto;
1702         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1703         int err = 0;
1704
1705         err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
1706                                NULL);
1707         if (err < 0)
1708                 return err;
1709
1710         rcu_read_lock();
1711         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1712         if (l4proto->from_nlattr)
1713                 err = l4proto->from_nlattr(tb, ct);
1714         rcu_read_unlock();
1715
1716         return err;
1717 }
1718
1719 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1720         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1721         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1722         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1723 };
1724
1725 static int change_seq_adj(struct nf_ct_seqadj *seq,
1726                           const struct nlattr * const attr)
1727 {
1728         int err;
1729         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1730
1731         err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
1732         if (err < 0)
1733                 return err;
1734
1735         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1736                 return -EINVAL;
1737
1738         seq->correction_pos =
1739                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1740
1741         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1742                 return -EINVAL;
1743
1744         seq->offset_before =
1745                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1746
1747         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1748                 return -EINVAL;
1749
1750         seq->offset_after =
1751                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1752
1753         return 0;
1754 }
1755
1756 static int
1757 ctnetlink_change_seq_adj(struct nf_conn *ct,
1758                          const struct nlattr * const cda[])
1759 {
1760         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1761         int ret = 0;
1762
1763         if (!seqadj)
1764                 return 0;
1765
1766         spin_lock_bh(&ct->lock);
1767         if (cda[CTA_SEQ_ADJ_ORIG]) {
1768                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1769                                      cda[CTA_SEQ_ADJ_ORIG]);
1770                 if (ret < 0)
1771                         goto err;
1772
1773                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1774         }
1775
1776         if (cda[CTA_SEQ_ADJ_REPLY]) {
1777                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1778                                      cda[CTA_SEQ_ADJ_REPLY]);
1779                 if (ret < 0)
1780                         goto err;
1781
1782                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1783         }
1784
1785         spin_unlock_bh(&ct->lock);
1786         return 0;
1787 err:
1788         spin_unlock_bh(&ct->lock);
1789         return ret;
1790 }
1791
1792 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1793         [CTA_SYNPROXY_ISN]      = { .type = NLA_U32 },
1794         [CTA_SYNPROXY_ITS]      = { .type = NLA_U32 },
1795         [CTA_SYNPROXY_TSOFF]    = { .type = NLA_U32 },
1796 };
1797
1798 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1799                                      const struct nlattr * const cda[])
1800 {
1801         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1802         struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1803         int err;
1804
1805         if (!synproxy)
1806                 return 0;
1807
1808         err = nla_parse_nested(tb, CTA_SYNPROXY_MAX, cda[CTA_SYNPROXY],
1809                                synproxy_policy, NULL);
1810         if (err < 0)
1811                 return err;
1812
1813         if (!tb[CTA_SYNPROXY_ISN] ||
1814             !tb[CTA_SYNPROXY_ITS] ||
1815             !tb[CTA_SYNPROXY_TSOFF])
1816                 return -EINVAL;
1817
1818         synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1819         synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1820         synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1821
1822         return 0;
1823 }
1824
1825 static int
1826 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1827 {
1828 #ifdef CONFIG_NF_CONNTRACK_LABELS
1829         size_t len = nla_len(cda[CTA_LABELS]);
1830         const void *mask = cda[CTA_LABELS_MASK];
1831
1832         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1833                 return -EINVAL;
1834
1835         if (mask) {
1836                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1837                     nla_len(cda[CTA_LABELS_MASK]) != len)
1838                         return -EINVAL;
1839                 mask = nla_data(cda[CTA_LABELS_MASK]);
1840         }
1841
1842         len /= sizeof(u32);
1843
1844         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1845 #else
1846         return -EOPNOTSUPP;
1847 #endif
1848 }
1849
1850 static int
1851 ctnetlink_change_conntrack(struct nf_conn *ct,
1852                            const struct nlattr * const cda[])
1853 {
1854         int err;
1855
1856         /* only allow NAT changes and master assignation for new conntracks */
1857         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1858                 return -EOPNOTSUPP;
1859
1860         if (cda[CTA_HELP]) {
1861                 err = ctnetlink_change_helper(ct, cda);
1862                 if (err < 0)
1863                         return err;
1864         }
1865
1866         if (cda[CTA_TIMEOUT]) {
1867                 err = ctnetlink_change_timeout(ct, cda);
1868                 if (err < 0)
1869                         return err;
1870         }
1871
1872         if (cda[CTA_STATUS]) {
1873                 err = ctnetlink_change_status(ct, cda);
1874                 if (err < 0)
1875                         return err;
1876         }
1877
1878         if (cda[CTA_PROTOINFO]) {
1879                 err = ctnetlink_change_protoinfo(ct, cda);
1880                 if (err < 0)
1881                         return err;
1882         }
1883
1884 #if defined(CONFIG_NF_CONNTRACK_MARK)
1885         if (cda[CTA_MARK])
1886                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1887 #endif
1888
1889         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1890                 err = ctnetlink_change_seq_adj(ct, cda);
1891                 if (err < 0)
1892                         return err;
1893         }
1894
1895         if (cda[CTA_SYNPROXY]) {
1896                 err = ctnetlink_change_synproxy(ct, cda);
1897                 if (err < 0)
1898                         return err;
1899         }
1900
1901         if (cda[CTA_LABELS]) {
1902                 err = ctnetlink_attach_labels(ct, cda);
1903                 if (err < 0)
1904                         return err;
1905         }
1906
1907         return 0;
1908 }
1909
1910 static struct nf_conn *
1911 ctnetlink_create_conntrack(struct net *net,
1912                            const struct nf_conntrack_zone *zone,
1913                            const struct nlattr * const cda[],
1914                            struct nf_conntrack_tuple *otuple,
1915                            struct nf_conntrack_tuple *rtuple,
1916                            u8 u3)
1917 {
1918         struct nf_conn *ct;
1919         int err = -EINVAL;
1920         struct nf_conntrack_helper *helper;
1921         struct nf_conn_tstamp *tstamp;
1922         u64 timeout;
1923
1924         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1925         if (IS_ERR(ct))
1926                 return ERR_PTR(-ENOMEM);
1927
1928         if (!cda[CTA_TIMEOUT])
1929                 goto err1;
1930
1931         timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1932         if (timeout > INT_MAX)
1933                 timeout = INT_MAX;
1934         ct->timeout = (u32)timeout + nfct_time_stamp;
1935
1936         rcu_read_lock();
1937         if (cda[CTA_HELP]) {
1938                 char *helpname = NULL;
1939                 struct nlattr *helpinfo = NULL;
1940
1941                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1942                 if (err < 0)
1943                         goto err2;
1944
1945                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1946                                                     nf_ct_protonum(ct));
1947                 if (helper == NULL) {
1948                         rcu_read_unlock();
1949 #ifdef CONFIG_MODULES
1950                         if (request_module("nfct-helper-%s", helpname) < 0) {
1951                                 err = -EOPNOTSUPP;
1952                                 goto err1;
1953                         }
1954
1955                         rcu_read_lock();
1956                         helper = __nf_conntrack_helper_find(helpname,
1957                                                             nf_ct_l3num(ct),
1958                                                             nf_ct_protonum(ct));
1959                         if (helper) {
1960                                 err = -EAGAIN;
1961                                 goto err2;
1962                         }
1963                         rcu_read_unlock();
1964 #endif
1965                         err = -EOPNOTSUPP;
1966                         goto err1;
1967                 } else {
1968                         struct nf_conn_help *help;
1969
1970                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1971                         if (help == NULL) {
1972                                 err = -ENOMEM;
1973                                 goto err2;
1974                         }
1975                         /* set private helper data if allowed. */
1976                         if (helper->from_nlattr)
1977                                 helper->from_nlattr(helpinfo, ct);
1978
1979                         /* not in hash table yet so not strictly necessary */
1980                         RCU_INIT_POINTER(help->helper, helper);
1981                 }
1982         } else {
1983                 /* try an implicit helper assignation */
1984                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1985                 if (err < 0)
1986                         goto err2;
1987         }
1988
1989         err = ctnetlink_setup_nat(ct, cda);
1990         if (err < 0)
1991                 goto err2;
1992
1993         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1994         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1995         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1996         nf_ct_labels_ext_add(ct);
1997         nfct_seqadj_ext_add(ct);
1998         nfct_synproxy_ext_add(ct);
1999
2000         /* we must add conntrack extensions before confirmation. */
2001         ct->status |= IPS_CONFIRMED;
2002
2003         if (cda[CTA_STATUS]) {
2004                 err = ctnetlink_change_status(ct, cda);
2005                 if (err < 0)
2006                         goto err2;
2007         }
2008
2009         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2010                 err = ctnetlink_change_seq_adj(ct, cda);
2011                 if (err < 0)
2012                         goto err2;
2013         }
2014
2015         memset(&ct->proto, 0, sizeof(ct->proto));
2016         if (cda[CTA_PROTOINFO]) {
2017                 err = ctnetlink_change_protoinfo(ct, cda);
2018                 if (err < 0)
2019                         goto err2;
2020         }
2021
2022         if (cda[CTA_SYNPROXY]) {
2023                 err = ctnetlink_change_synproxy(ct, cda);
2024                 if (err < 0)
2025                         goto err2;
2026         }
2027
2028 #if defined(CONFIG_NF_CONNTRACK_MARK)
2029         if (cda[CTA_MARK])
2030                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2031 #endif
2032
2033         /* setup master conntrack: this is a confirmed expectation */
2034         if (cda[CTA_TUPLE_MASTER]) {
2035                 struct nf_conntrack_tuple master;
2036                 struct nf_conntrack_tuple_hash *master_h;
2037                 struct nf_conn *master_ct;
2038
2039                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2040                                             u3, NULL);
2041                 if (err < 0)
2042                         goto err2;
2043
2044                 master_h = nf_conntrack_find_get(net, zone, &master);
2045                 if (master_h == NULL) {
2046                         err = -ENOENT;
2047                         goto err2;
2048                 }
2049                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2050                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2051                 ct->master = master_ct;
2052         }
2053         tstamp = nf_conn_tstamp_find(ct);
2054         if (tstamp)
2055                 tstamp->start = ktime_get_real_ns();
2056
2057         err = nf_conntrack_hash_check_insert(ct);
2058         if (err < 0)
2059                 goto err2;
2060
2061         rcu_read_unlock();
2062
2063         return ct;
2064
2065 err2:
2066         rcu_read_unlock();
2067 err1:
2068         nf_conntrack_free(ct);
2069         return ERR_PTR(err);
2070 }
2071
2072 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2073                                    struct sk_buff *skb,
2074                                    const struct nlmsghdr *nlh,
2075                                    const struct nlattr * const cda[],
2076                                    struct netlink_ext_ack *extack)
2077 {
2078         struct nf_conntrack_tuple otuple, rtuple;
2079         struct nf_conntrack_tuple_hash *h = NULL;
2080         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2081         struct nf_conn *ct;
2082         u_int8_t u3 = nfmsg->nfgen_family;
2083         struct nf_conntrack_zone zone;
2084         int err;
2085
2086         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2087         if (err < 0)
2088                 return err;
2089
2090         if (cda[CTA_TUPLE_ORIG]) {
2091                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2092                                             u3, &zone);
2093                 if (err < 0)
2094                         return err;
2095         }
2096
2097         if (cda[CTA_TUPLE_REPLY]) {
2098                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2099                                             u3, &zone);
2100                 if (err < 0)
2101                         return err;
2102         }
2103
2104         if (cda[CTA_TUPLE_ORIG])
2105                 h = nf_conntrack_find_get(net, &zone, &otuple);
2106         else if (cda[CTA_TUPLE_REPLY])
2107                 h = nf_conntrack_find_get(net, &zone, &rtuple);
2108
2109         if (h == NULL) {
2110                 err = -ENOENT;
2111                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2112                         enum ip_conntrack_events events;
2113
2114                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2115                                 return -EINVAL;
2116                         if (otuple.dst.protonum != rtuple.dst.protonum)
2117                                 return -EINVAL;
2118
2119                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2120                                                         &rtuple, u3);
2121                         if (IS_ERR(ct))
2122                                 return PTR_ERR(ct);
2123
2124                         err = 0;
2125                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2126                                 events = 1 << IPCT_RELATED;
2127                         else
2128                                 events = 1 << IPCT_NEW;
2129
2130                         if (cda[CTA_LABELS] &&
2131                             ctnetlink_attach_labels(ct, cda) == 0)
2132                                 events |= (1 << IPCT_LABEL);
2133
2134                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2135                                                       (1 << IPCT_ASSURED) |
2136                                                       (1 << IPCT_HELPER) |
2137                                                       (1 << IPCT_PROTOINFO) |
2138                                                       (1 << IPCT_SEQADJ) |
2139                                                       (1 << IPCT_MARK) |
2140                                                       (1 << IPCT_SYNPROXY) |
2141                                                       events,
2142                                                       ct, NETLINK_CB(skb).portid,
2143                                                       nlmsg_report(nlh));
2144                         nf_ct_put(ct);
2145                 }
2146
2147                 return err;
2148         }
2149         /* implicit 'else' */
2150
2151         err = -EEXIST;
2152         ct = nf_ct_tuplehash_to_ctrack(h);
2153         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2154                 err = ctnetlink_change_conntrack(ct, cda);
2155                 if (err == 0) {
2156                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2157                                                       (1 << IPCT_ASSURED) |
2158                                                       (1 << IPCT_HELPER) |
2159                                                       (1 << IPCT_LABEL) |
2160                                                       (1 << IPCT_PROTOINFO) |
2161                                                       (1 << IPCT_SEQADJ) |
2162                                                       (1 << IPCT_MARK) |
2163                                                       (1 << IPCT_SYNPROXY),
2164                                                       ct, NETLINK_CB(skb).portid,
2165                                                       nlmsg_report(nlh));
2166                 }
2167         }
2168
2169         nf_ct_put(ct);
2170         return err;
2171 }
2172
2173 static int
2174 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2175                                 __u16 cpu, const struct ip_conntrack_stat *st)
2176 {
2177         struct nlmsghdr *nlh;
2178         struct nfgenmsg *nfmsg;
2179         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2180
2181         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2182                               IPCTNL_MSG_CT_GET_STATS_CPU);
2183         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2184         if (nlh == NULL)
2185                 goto nlmsg_failure;
2186
2187         nfmsg = nlmsg_data(nlh);
2188         nfmsg->nfgen_family = AF_UNSPEC;
2189         nfmsg->version      = NFNETLINK_V0;
2190         nfmsg->res_id       = htons(cpu);
2191
2192         if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2193             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2194             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2195             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2196             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2197                                 htonl(st->insert_failed)) ||
2198             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2199             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2200             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2201             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2202                                 htonl(st->search_restart)))
2203                 goto nla_put_failure;
2204
2205         nlmsg_end(skb, nlh);
2206         return skb->len;
2207
2208 nla_put_failure:
2209 nlmsg_failure:
2210         nlmsg_cancel(skb, nlh);
2211         return -1;
2212 }
2213
2214 static int
2215 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2216 {
2217         int cpu;
2218         struct net *net = sock_net(skb->sk);
2219
2220         if (cb->args[0] == nr_cpu_ids)
2221                 return 0;
2222
2223         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2224                 const struct ip_conntrack_stat *st;
2225
2226                 if (!cpu_possible(cpu))
2227                         continue;
2228
2229                 st = per_cpu_ptr(net->ct.stat, cpu);
2230                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2231                                                     NETLINK_CB(cb->skb).portid,
2232                                                     cb->nlh->nlmsg_seq,
2233                                                     cpu, st) < 0)
2234                                 break;
2235         }
2236         cb->args[0] = cpu;
2237
2238         return skb->len;
2239 }
2240
2241 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2242                                  struct sk_buff *skb,
2243                                  const struct nlmsghdr *nlh,
2244                                  const struct nlattr * const cda[],
2245                                  struct netlink_ext_ack *extack)
2246 {
2247         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2248                 struct netlink_dump_control c = {
2249                         .dump = ctnetlink_ct_stat_cpu_dump,
2250                 };
2251                 return netlink_dump_start(ctnl, skb, nlh, &c);
2252         }
2253
2254         return 0;
2255 }
2256
2257 static int
2258 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2259                             struct net *net)
2260 {
2261         struct nlmsghdr *nlh;
2262         struct nfgenmsg *nfmsg;
2263         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2264         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2265
2266         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2267         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2268         if (nlh == NULL)
2269                 goto nlmsg_failure;
2270
2271         nfmsg = nlmsg_data(nlh);
2272         nfmsg->nfgen_family = AF_UNSPEC;
2273         nfmsg->version      = NFNETLINK_V0;
2274         nfmsg->res_id       = 0;
2275
2276         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2277                 goto nla_put_failure;
2278
2279         if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2280                 goto nla_put_failure;
2281
2282         nlmsg_end(skb, nlh);
2283         return skb->len;
2284
2285 nla_put_failure:
2286 nlmsg_failure:
2287         nlmsg_cancel(skb, nlh);
2288         return -1;
2289 }
2290
2291 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2292                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2293                              const struct nlattr * const cda[],
2294                              struct netlink_ext_ack *extack)
2295 {
2296         struct sk_buff *skb2;
2297         int err;
2298
2299         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2300         if (skb2 == NULL)
2301                 return -ENOMEM;
2302
2303         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2304                                           nlh->nlmsg_seq,
2305                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2306                                           sock_net(skb->sk));
2307         if (err <= 0)
2308                 goto free;
2309
2310         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2311         if (err < 0)
2312                 goto out;
2313
2314         return 0;
2315
2316 free:
2317         kfree_skb(skb2);
2318 out:
2319         /* this avoids a loop in nfnetlink. */
2320         return err == -EAGAIN ? -ENOBUFS : err;
2321 }
2322
2323 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2324         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2325         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2326         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2327         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2328         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2329         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2330                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2331         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2332         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2333         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2334         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2335         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2336 };
2337
2338 static struct nf_conntrack_expect *
2339 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2340                        struct nf_conntrack_helper *helper,
2341                        struct nf_conntrack_tuple *tuple,
2342                        struct nf_conntrack_tuple *mask);
2343
2344 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2345 static size_t
2346 ctnetlink_glue_build_size(const struct nf_conn *ct)
2347 {
2348         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2349                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2350                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2351                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2352                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2353                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2354                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2355                + nla_total_size(0) /* CTA_PROTOINFO */
2356                + nla_total_size(0) /* CTA_HELP */
2357                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2358                + ctnetlink_secctx_size(ct)
2359 #ifdef CONFIG_NF_NAT_NEEDED
2360                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2361                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2362 #endif
2363 #ifdef CONFIG_NF_CONNTRACK_MARK
2364                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2365 #endif
2366 #ifdef CONFIG_NF_CONNTRACK_ZONES
2367                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2368 #endif
2369                + ctnetlink_proto_size(ct)
2370                ;
2371 }
2372
2373 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2374                                              enum ip_conntrack_info *ctinfo)
2375 {
2376         return nf_ct_get(skb, ctinfo);
2377 }
2378
2379 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2380 {
2381         const struct nf_conntrack_zone *zone;
2382         struct nlattr *nest_parms;
2383
2384         zone = nf_ct_zone(ct);
2385
2386         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2387         if (!nest_parms)
2388                 goto nla_put_failure;
2389         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2390                 goto nla_put_failure;
2391         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2392                                    NF_CT_ZONE_DIR_ORIG) < 0)
2393                 goto nla_put_failure;
2394         nla_nest_end(skb, nest_parms);
2395
2396         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2397         if (!nest_parms)
2398                 goto nla_put_failure;
2399         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2400                 goto nla_put_failure;
2401         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2402                                    NF_CT_ZONE_DIR_REPL) < 0)
2403                 goto nla_put_failure;
2404         nla_nest_end(skb, nest_parms);
2405
2406         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2407                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2408                 goto nla_put_failure;
2409
2410         if (ctnetlink_dump_id(skb, ct) < 0)
2411                 goto nla_put_failure;
2412
2413         if (ctnetlink_dump_status(skb, ct) < 0)
2414                 goto nla_put_failure;
2415
2416         if (ctnetlink_dump_timeout(skb, ct) < 0)
2417                 goto nla_put_failure;
2418
2419         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2420                 goto nla_put_failure;
2421
2422         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2423                 goto nla_put_failure;
2424
2425 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2426         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2427                 goto nla_put_failure;
2428 #endif
2429         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2430                 goto nla_put_failure;
2431
2432         if ((ct->status & IPS_SEQ_ADJUST) &&
2433             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2434                 goto nla_put_failure;
2435
2436         if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2437                 goto nla_put_failure;
2438
2439 #ifdef CONFIG_NF_CONNTRACK_MARK
2440         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2441                 goto nla_put_failure;
2442 #endif
2443         if (ctnetlink_dump_labels(skb, ct) < 0)
2444                 goto nla_put_failure;
2445         return 0;
2446
2447 nla_put_failure:
2448         return -ENOSPC;
2449 }
2450
2451 static int
2452 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2453                      enum ip_conntrack_info ctinfo,
2454                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2455 {
2456         struct nlattr *nest_parms;
2457
2458         nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2459         if (!nest_parms)
2460                 goto nla_put_failure;
2461
2462         if (__ctnetlink_glue_build(skb, ct) < 0)
2463                 goto nla_put_failure;
2464
2465         nla_nest_end(skb, nest_parms);
2466
2467         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2468                 goto nla_put_failure;
2469
2470         return 0;
2471
2472 nla_put_failure:
2473         return -ENOSPC;
2474 }
2475
2476 static int
2477 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2478 {
2479         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2480         unsigned long d = ct->status ^ status;
2481
2482         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2483                 /* SEEN_REPLY bit can only be set */
2484                 return -EBUSY;
2485
2486         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2487                 /* ASSURED bit can only be set */
2488                 return -EBUSY;
2489
2490         /* This check is less strict than ctnetlink_change_status()
2491          * because callers often flip IPS_EXPECTED bits when sending
2492          * an NFQA_CT attribute to the kernel.  So ignore the
2493          * unchangeable bits but do not error out. Also user programs
2494          * are allowed to clear the bits that they are allowed to change.
2495          */
2496         __ctnetlink_change_status(ct, status, ~status);
2497         return 0;
2498 }
2499
2500 static int
2501 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2502 {
2503         int err;
2504
2505         if (cda[CTA_TIMEOUT]) {
2506                 err = ctnetlink_change_timeout(ct, cda);
2507                 if (err < 0)
2508                         return err;
2509         }
2510         if (cda[CTA_STATUS]) {
2511                 err = ctnetlink_update_status(ct, cda);
2512                 if (err < 0)
2513                         return err;
2514         }
2515         if (cda[CTA_HELP]) {
2516                 err = ctnetlink_change_helper(ct, cda);
2517                 if (err < 0)
2518                         return err;
2519         }
2520         if (cda[CTA_LABELS]) {
2521                 err = ctnetlink_attach_labels(ct, cda);
2522                 if (err < 0)
2523                         return err;
2524         }
2525 #if defined(CONFIG_NF_CONNTRACK_MARK)
2526         if (cda[CTA_MARK]) {
2527                 u32 mask = 0, mark, newmark;
2528                 if (cda[CTA_MARK_MASK])
2529                         mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2530
2531                 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2532                 newmark = (ct->mark & mask) ^ mark;
2533                 if (newmark != ct->mark)
2534                         ct->mark = newmark;
2535         }
2536 #endif
2537         return 0;
2538 }
2539
2540 static int
2541 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2542 {
2543         struct nlattr *cda[CTA_MAX+1];
2544         int ret;
2545
2546         ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
2547         if (ret < 0)
2548                 return ret;
2549
2550         return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2551 }
2552
2553 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2554                                     const struct nf_conn *ct,
2555                                     struct nf_conntrack_tuple *tuple,
2556                                     struct nf_conntrack_tuple *mask)
2557 {
2558         int err;
2559
2560         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2561                                     nf_ct_l3num(ct), NULL);
2562         if (err < 0)
2563                 return err;
2564
2565         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2566                                      nf_ct_l3num(ct), NULL);
2567 }
2568
2569 static int
2570 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2571                              u32 portid, u32 report)
2572 {
2573         struct nlattr *cda[CTA_EXPECT_MAX+1];
2574         struct nf_conntrack_tuple tuple, mask;
2575         struct nf_conntrack_helper *helper = NULL;
2576         struct nf_conntrack_expect *exp;
2577         int err;
2578
2579         err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
2580                                NULL);
2581         if (err < 0)
2582                 return err;
2583
2584         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2585                                        ct, &tuple, &mask);
2586         if (err < 0)
2587                 return err;
2588
2589         if (cda[CTA_EXPECT_HELP_NAME]) {
2590                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2591
2592                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2593                                                     nf_ct_protonum(ct));
2594                 if (helper == NULL)
2595                         return -EOPNOTSUPP;
2596         }
2597
2598         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2599                                      helper, &tuple, &mask);
2600         if (IS_ERR(exp))
2601                 return PTR_ERR(exp);
2602
2603         err = nf_ct_expect_related_report(exp, portid, report);
2604         nf_ct_expect_put(exp);
2605         return err;
2606 }
2607
2608 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2609                                   enum ip_conntrack_info ctinfo, int diff)
2610 {
2611         if (!(ct->status & IPS_NAT_MASK))
2612                 return;
2613
2614         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2615 }
2616
2617 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2618         .get_ct         = ctnetlink_glue_get_ct,
2619         .build_size     = ctnetlink_glue_build_size,
2620         .build          = ctnetlink_glue_build,
2621         .parse          = ctnetlink_glue_parse,
2622         .attach_expect  = ctnetlink_glue_attach_expect,
2623         .seq_adjust     = ctnetlink_glue_seqadj,
2624 };
2625 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2626
2627 /***********************************************************************
2628  * EXPECT
2629  ***********************************************************************/
2630
2631 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2632                                     const struct nf_conntrack_tuple *tuple,
2633                                     u32 type)
2634 {
2635         struct nlattr *nest_parms;
2636
2637         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2638         if (!nest_parms)
2639                 goto nla_put_failure;
2640         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2641                 goto nla_put_failure;
2642         nla_nest_end(skb, nest_parms);
2643
2644         return 0;
2645
2646 nla_put_failure:
2647         return -1;
2648 }
2649
2650 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2651                                    const struct nf_conntrack_tuple *tuple,
2652                                    const struct nf_conntrack_tuple_mask *mask)
2653 {
2654         const struct nf_conntrack_l4proto *l4proto;
2655         struct nf_conntrack_tuple m;
2656         struct nlattr *nest_parms;
2657         int ret;
2658
2659         memset(&m, 0xFF, sizeof(m));
2660         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2661         m.src.u.all = mask->src.u.all;
2662         m.src.l3num = tuple->src.l3num;
2663         m.dst.protonum = tuple->dst.protonum;
2664
2665         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2666         if (!nest_parms)
2667                 goto nla_put_failure;
2668
2669         rcu_read_lock();
2670         ret = ctnetlink_dump_tuples_ip(skb, &m);
2671         if (ret >= 0) {
2672                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2673                                                tuple->dst.protonum);
2674         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2675         }
2676         rcu_read_unlock();
2677
2678         if (unlikely(ret < 0))
2679                 goto nla_put_failure;
2680
2681         nla_nest_end(skb, nest_parms);
2682
2683         return 0;
2684
2685 nla_put_failure:
2686         return -1;
2687 }
2688
2689 static const union nf_inet_addr any_addr;
2690
2691 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2692 {
2693         static __read_mostly siphash_key_t exp_id_seed;
2694         unsigned long a, b, c, d;
2695
2696         net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2697
2698         a = (unsigned long)exp;
2699         b = (unsigned long)exp->helper;
2700         c = (unsigned long)exp->master;
2701         d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2702
2703 #ifdef CONFIG_64BIT
2704         return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2705 #else
2706         return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2707 #endif
2708 }
2709
2710 static int
2711 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2712                           const struct nf_conntrack_expect *exp)
2713 {
2714         struct nf_conn *master = exp->master;
2715         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2716         struct nf_conn_help *help;
2717 #ifdef CONFIG_NF_NAT_NEEDED
2718         struct nlattr *nest_parms;
2719         struct nf_conntrack_tuple nat_tuple = {};
2720 #endif
2721         struct nf_ct_helper_expectfn *expfn;
2722
2723         if (timeout < 0)
2724                 timeout = 0;
2725
2726         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2727                 goto nla_put_failure;
2728         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2729                 goto nla_put_failure;
2730         if (ctnetlink_exp_dump_tuple(skb,
2731                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2732                                  CTA_EXPECT_MASTER) < 0)
2733                 goto nla_put_failure;
2734
2735 #ifdef CONFIG_NF_NAT_NEEDED
2736         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2737             exp->saved_proto.all) {
2738                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2739                 if (!nest_parms)
2740                         goto nla_put_failure;
2741
2742                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2743                         goto nla_put_failure;
2744
2745                 nat_tuple.src.l3num = nf_ct_l3num(master);
2746                 nat_tuple.src.u3 = exp->saved_addr;
2747                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2748                 nat_tuple.src.u = exp->saved_proto;
2749
2750                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2751                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2752                         goto nla_put_failure;
2753                 nla_nest_end(skb, nest_parms);
2754         }
2755 #endif
2756         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2757             nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2758             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2759             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2760                 goto nla_put_failure;
2761         help = nfct_help(master);
2762         if (help) {
2763                 struct nf_conntrack_helper *helper;
2764
2765                 helper = rcu_dereference(help->helper);
2766                 if (helper &&
2767                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2768                         goto nla_put_failure;
2769         }
2770         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2771         if (expfn != NULL &&
2772             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2773                 goto nla_put_failure;
2774
2775         return 0;
2776
2777 nla_put_failure:
2778         return -1;
2779 }
2780
2781 static int
2782 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2783                         int event, const struct nf_conntrack_expect *exp)
2784 {
2785         struct nlmsghdr *nlh;
2786         struct nfgenmsg *nfmsg;
2787         unsigned int flags = portid ? NLM_F_MULTI : 0;
2788
2789         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2790         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2791         if (nlh == NULL)
2792                 goto nlmsg_failure;
2793
2794         nfmsg = nlmsg_data(nlh);
2795         nfmsg->nfgen_family = exp->tuple.src.l3num;
2796         nfmsg->version      = NFNETLINK_V0;
2797         nfmsg->res_id       = 0;
2798
2799         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2800                 goto nla_put_failure;
2801
2802         nlmsg_end(skb, nlh);
2803         return skb->len;
2804
2805 nlmsg_failure:
2806 nla_put_failure:
2807         nlmsg_cancel(skb, nlh);
2808         return -1;
2809 }
2810
2811 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2812 static int
2813 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2814 {
2815         struct nf_conntrack_expect *exp = item->exp;
2816         struct net *net = nf_ct_exp_net(exp);
2817         struct nlmsghdr *nlh;
2818         struct nfgenmsg *nfmsg;
2819         struct sk_buff *skb;
2820         unsigned int type, group;
2821         int flags = 0;
2822
2823         if (events & (1 << IPEXP_DESTROY)) {
2824                 type = IPCTNL_MSG_EXP_DELETE;
2825                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2826         } else if (events & (1 << IPEXP_NEW)) {
2827                 type = IPCTNL_MSG_EXP_NEW;
2828                 flags = NLM_F_CREATE|NLM_F_EXCL;
2829                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2830         } else
2831                 return 0;
2832
2833         if (!item->report && !nfnetlink_has_listeners(net, group))
2834                 return 0;
2835
2836         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2837         if (skb == NULL)
2838                 goto errout;
2839
2840         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2841         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2842         if (nlh == NULL)
2843                 goto nlmsg_failure;
2844
2845         nfmsg = nlmsg_data(nlh);
2846         nfmsg->nfgen_family = exp->tuple.src.l3num;
2847         nfmsg->version      = NFNETLINK_V0;
2848         nfmsg->res_id       = 0;
2849
2850         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2851                 goto nla_put_failure;
2852
2853         nlmsg_end(skb, nlh);
2854         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2855         return 0;
2856
2857 nla_put_failure:
2858         nlmsg_cancel(skb, nlh);
2859 nlmsg_failure:
2860         kfree_skb(skb);
2861 errout:
2862         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2863         return 0;
2864 }
2865 #endif
2866 static int ctnetlink_exp_done(struct netlink_callback *cb)
2867 {
2868         if (cb->args[1])
2869                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2870         return 0;
2871 }
2872
2873 static int
2874 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2875 {
2876         struct net *net = sock_net(skb->sk);
2877         struct nf_conntrack_expect *exp, *last;
2878         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2879         u_int8_t l3proto = nfmsg->nfgen_family;
2880
2881         rcu_read_lock();
2882         last = (struct nf_conntrack_expect *)cb->args[1];
2883         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2884 restart:
2885                 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2886                                          hnode) {
2887                         if (l3proto && exp->tuple.src.l3num != l3proto)
2888                                 continue;
2889
2890                         if (!net_eq(nf_ct_net(exp->master), net))
2891                                 continue;
2892
2893                         if (cb->args[1]) {
2894                                 if (exp != last)
2895                                         continue;
2896                                 cb->args[1] = 0;
2897                         }
2898                         if (ctnetlink_exp_fill_info(skb,
2899                                                     NETLINK_CB(cb->skb).portid,
2900                                                     cb->nlh->nlmsg_seq,
2901                                                     IPCTNL_MSG_EXP_NEW,
2902                                                     exp) < 0) {
2903                                 if (!refcount_inc_not_zero(&exp->use))
2904                                         continue;
2905                                 cb->args[1] = (unsigned long)exp;
2906                                 goto out;
2907                         }
2908                 }
2909                 if (cb->args[1]) {
2910                         cb->args[1] = 0;
2911                         goto restart;
2912                 }
2913         }
2914 out:
2915         rcu_read_unlock();
2916         if (last)
2917                 nf_ct_expect_put(last);
2918
2919         return skb->len;
2920 }
2921
2922 static int
2923 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2924 {
2925         struct nf_conntrack_expect *exp, *last;
2926         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2927         struct nf_conn *ct = cb->data;
2928         struct nf_conn_help *help = nfct_help(ct);
2929         u_int8_t l3proto = nfmsg->nfgen_family;
2930
2931         if (cb->args[0])
2932                 return 0;
2933
2934         rcu_read_lock();
2935         last = (struct nf_conntrack_expect *)cb->args[1];
2936 restart:
2937         hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2938                 if (l3proto && exp->tuple.src.l3num != l3proto)
2939                         continue;
2940                 if (cb->args[1]) {
2941                         if (exp != last)
2942                                 continue;
2943                         cb->args[1] = 0;
2944                 }
2945                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2946                                             cb->nlh->nlmsg_seq,
2947                                             IPCTNL_MSG_EXP_NEW,
2948                                             exp) < 0) {
2949                         if (!refcount_inc_not_zero(&exp->use))
2950                                 continue;
2951                         cb->args[1] = (unsigned long)exp;
2952                         goto out;
2953                 }
2954         }
2955         if (cb->args[1]) {
2956                 cb->args[1] = 0;
2957                 goto restart;
2958         }
2959         cb->args[0] = 1;
2960 out:
2961         rcu_read_unlock();
2962         if (last)
2963                 nf_ct_expect_put(last);
2964
2965         return skb->len;
2966 }
2967
2968 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2969                                  struct sk_buff *skb,
2970                                  const struct nlmsghdr *nlh,
2971                                  const struct nlattr * const cda[],
2972                                  struct netlink_ext_ack *extack)
2973 {
2974         int err;
2975         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2976         u_int8_t u3 = nfmsg->nfgen_family;
2977         struct nf_conntrack_tuple tuple;
2978         struct nf_conntrack_tuple_hash *h;
2979         struct nf_conn *ct;
2980         struct nf_conntrack_zone zone;
2981         struct netlink_dump_control c = {
2982                 .dump = ctnetlink_exp_ct_dump_table,
2983                 .done = ctnetlink_exp_done,
2984         };
2985
2986         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2987                                     u3, NULL);
2988         if (err < 0)
2989                 return err;
2990
2991         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2992         if (err < 0)
2993                 return err;
2994
2995         h = nf_conntrack_find_get(net, &zone, &tuple);
2996         if (!h)
2997                 return -ENOENT;
2998
2999         ct = nf_ct_tuplehash_to_ctrack(h);
3000         /* No expectation linked to this connection tracking. */
3001         if (!nfct_help(ct)) {
3002                 nf_ct_put(ct);
3003                 return 0;
3004         }
3005
3006         c.data = ct;
3007
3008         err = netlink_dump_start(ctnl, skb, nlh, &c);
3009         nf_ct_put(ct);
3010
3011         return err;
3012 }
3013
3014 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3015                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3016                                 const struct nlattr * const cda[],
3017                                 struct netlink_ext_ack *extack)
3018 {
3019         struct nf_conntrack_tuple tuple;
3020         struct nf_conntrack_expect *exp;
3021         struct sk_buff *skb2;
3022         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3023         u_int8_t u3 = nfmsg->nfgen_family;
3024         struct nf_conntrack_zone zone;
3025         int err;
3026
3027         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3028                 if (cda[CTA_EXPECT_MASTER])
3029                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3030                                                      extack);
3031                 else {
3032                         struct netlink_dump_control c = {
3033                                 .dump = ctnetlink_exp_dump_table,
3034                                 .done = ctnetlink_exp_done,
3035                         };
3036                         return netlink_dump_start(ctnl, skb, nlh, &c);
3037                 }
3038         }
3039
3040         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3041         if (err < 0)
3042                 return err;
3043
3044         if (cda[CTA_EXPECT_TUPLE])
3045                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3046                                             u3, NULL);
3047         else if (cda[CTA_EXPECT_MASTER])
3048                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3049                                             u3, NULL);
3050         else
3051                 return -EINVAL;
3052
3053         if (err < 0)
3054                 return err;
3055
3056         exp = nf_ct_expect_find_get(net, &zone, &tuple);
3057         if (!exp)
3058                 return -ENOENT;
3059
3060         if (cda[CTA_EXPECT_ID]) {
3061                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3062
3063                 if (id != nf_expect_get_id(exp)) {
3064                         nf_ct_expect_put(exp);
3065                         return -ENOENT;
3066                 }
3067         }
3068
3069         err = -ENOMEM;
3070         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3071         if (skb2 == NULL) {
3072                 nf_ct_expect_put(exp);
3073                 goto out;
3074         }
3075
3076         rcu_read_lock();
3077         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3078                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3079         rcu_read_unlock();
3080         nf_ct_expect_put(exp);
3081         if (err <= 0)
3082                 goto free;
3083
3084         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3085         if (err < 0)
3086                 goto out;
3087
3088         return 0;
3089
3090 free:
3091         kfree_skb(skb2);
3092 out:
3093         /* this avoids a loop in nfnetlink. */
3094         return err == -EAGAIN ? -ENOBUFS : err;
3095 }
3096
3097 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3098 {
3099         const struct nf_conn_help *m_help;
3100         const char *name = data;
3101
3102         m_help = nfct_help(exp->master);
3103
3104         return strcmp(m_help->helper->name, name) == 0;
3105 }
3106
3107 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3108 {
3109         return true;
3110 }
3111
3112 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3113                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3114                                 const struct nlattr * const cda[],
3115                                 struct netlink_ext_ack *extack)
3116 {
3117         struct nf_conntrack_expect *exp;
3118         struct nf_conntrack_tuple tuple;
3119         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3120         u_int8_t u3 = nfmsg->nfgen_family;
3121         struct nf_conntrack_zone zone;
3122         int err;
3123
3124         if (cda[CTA_EXPECT_TUPLE]) {
3125                 /* delete a single expect by tuple */
3126                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3127                 if (err < 0)
3128                         return err;
3129
3130                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3131                                             u3, NULL);
3132                 if (err < 0)
3133                         return err;
3134
3135                 /* bump usage count to 2 */
3136                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3137                 if (!exp)
3138                         return -ENOENT;
3139
3140                 if (cda[CTA_EXPECT_ID]) {
3141                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3142                         if (ntohl(id) != (u32)(unsigned long)exp) {
3143                                 nf_ct_expect_put(exp);
3144                                 return -ENOENT;
3145                         }
3146                 }
3147
3148                 /* after list removal, usage count == 1 */
3149                 spin_lock_bh(&nf_conntrack_expect_lock);
3150                 if (del_timer(&exp->timeout)) {
3151                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3152                                                    nlmsg_report(nlh));
3153                         nf_ct_expect_put(exp);
3154                 }
3155                 spin_unlock_bh(&nf_conntrack_expect_lock);
3156                 /* have to put what we 'get' above.
3157                  * after this line usage count == 0 */
3158                 nf_ct_expect_put(exp);
3159         } else if (cda[CTA_EXPECT_HELP_NAME]) {
3160                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3161
3162                 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3163                                          NETLINK_CB(skb).portid,
3164                                          nlmsg_report(nlh));
3165         } else {
3166                 /* This basically means we have to flush everything*/
3167                 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3168                                          NETLINK_CB(skb).portid,
3169                                          nlmsg_report(nlh));
3170         }
3171
3172         return 0;
3173 }
3174 static int
3175 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3176                         const struct nlattr * const cda[])
3177 {
3178         if (cda[CTA_EXPECT_TIMEOUT]) {
3179                 if (!del_timer(&x->timeout))
3180                         return -ETIME;
3181
3182                 x->timeout.expires = jiffies +
3183                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3184                 add_timer(&x->timeout);
3185         }
3186         return 0;
3187 }
3188
3189 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3190         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
3191         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
3192 };
3193
3194 static int
3195 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3196                            struct nf_conntrack_expect *exp,
3197                            u_int8_t u3)
3198 {
3199 #ifdef CONFIG_NF_NAT_NEEDED
3200         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3201         struct nf_conntrack_tuple nat_tuple = {};
3202         int err;
3203
3204         err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr,
3205                                exp_nat_nla_policy, NULL);
3206         if (err < 0)
3207                 return err;
3208
3209         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3210                 return -EINVAL;
3211
3212         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3213                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3214                                     u3, NULL);
3215         if (err < 0)
3216                 return err;
3217
3218         exp->saved_addr = nat_tuple.src.u3;
3219         exp->saved_proto = nat_tuple.src.u;
3220         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3221
3222         return 0;
3223 #else
3224         return -EOPNOTSUPP;
3225 #endif
3226 }
3227
3228 static struct nf_conntrack_expect *
3229 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3230                        struct nf_conntrack_helper *helper,
3231                        struct nf_conntrack_tuple *tuple,
3232                        struct nf_conntrack_tuple *mask)
3233 {
3234         u_int32_t class = 0;
3235         struct nf_conntrack_expect *exp;
3236         struct nf_conn_help *help;
3237         int err;
3238
3239         help = nfct_help(ct);
3240         if (!help)
3241                 return ERR_PTR(-EOPNOTSUPP);
3242
3243         if (cda[CTA_EXPECT_CLASS] && helper) {
3244                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3245                 if (class > helper->expect_class_max)
3246                         return ERR_PTR(-EINVAL);
3247         }
3248         exp = nf_ct_expect_alloc(ct);
3249         if (!exp)
3250                 return ERR_PTR(-ENOMEM);
3251
3252         if (cda[CTA_EXPECT_FLAGS]) {
3253                 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3254                 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3255         } else {
3256                 exp->flags = 0;
3257         }
3258         if (cda[CTA_EXPECT_FN]) {
3259                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3260                 struct nf_ct_helper_expectfn *expfn;
3261
3262                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3263                 if (expfn == NULL) {
3264                         err = -EINVAL;
3265                         goto err_out;
3266                 }
3267                 exp->expectfn = expfn->expectfn;
3268         } else
3269                 exp->expectfn = NULL;
3270
3271         exp->class = class;
3272         exp->master = ct;
3273         exp->helper = helper;
3274         exp->tuple = *tuple;
3275         exp->mask.src.u3 = mask->src.u3;
3276         exp->mask.src.u.all = mask->src.u.all;
3277
3278         if (cda[CTA_EXPECT_NAT]) {
3279                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3280                                                  exp, nf_ct_l3num(ct));
3281                 if (err < 0)
3282                         goto err_out;
3283         }
3284         return exp;
3285 err_out:
3286         nf_ct_expect_put(exp);
3287         return ERR_PTR(err);
3288 }
3289
3290 static int
3291 ctnetlink_create_expect(struct net *net,
3292                         const struct nf_conntrack_zone *zone,
3293                         const struct nlattr * const cda[],
3294                         u_int8_t u3, u32 portid, int report)
3295 {
3296         struct nf_conntrack_tuple tuple, mask, master_tuple;
3297         struct nf_conntrack_tuple_hash *h = NULL;
3298         struct nf_conntrack_helper *helper = NULL;
3299         struct nf_conntrack_expect *exp;
3300         struct nf_conn *ct;
3301         int err;
3302
3303         /* caller guarantees that those three CTA_EXPECT_* exist */
3304         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3305                                     u3, NULL);
3306         if (err < 0)
3307                 return err;
3308         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3309                                     u3, NULL);
3310         if (err < 0)
3311                 return err;
3312         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3313                                     u3, NULL);
3314         if (err < 0)
3315                 return err;
3316
3317         /* Look for master conntrack of this expectation */
3318         h = nf_conntrack_find_get(net, zone, &master_tuple);
3319         if (!h)
3320                 return -ENOENT;
3321         ct = nf_ct_tuplehash_to_ctrack(h);
3322
3323         rcu_read_lock();
3324         if (cda[CTA_EXPECT_HELP_NAME]) {
3325                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3326
3327                 helper = __nf_conntrack_helper_find(helpname, u3,
3328                                                     nf_ct_protonum(ct));
3329                 if (helper == NULL) {
3330                         rcu_read_unlock();
3331 #ifdef CONFIG_MODULES
3332                         if (request_module("nfct-helper-%s", helpname) < 0) {
3333                                 err = -EOPNOTSUPP;
3334                                 goto err_ct;
3335                         }
3336                         rcu_read_lock();
3337                         helper = __nf_conntrack_helper_find(helpname, u3,
3338                                                             nf_ct_protonum(ct));
3339                         if (helper) {
3340                                 err = -EAGAIN;
3341                                 goto err_rcu;
3342                         }
3343                         rcu_read_unlock();
3344 #endif
3345                         err = -EOPNOTSUPP;
3346                         goto err_ct;
3347                 }
3348         }
3349
3350         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3351         if (IS_ERR(exp)) {
3352                 err = PTR_ERR(exp);
3353                 goto err_rcu;
3354         }
3355
3356         err = nf_ct_expect_related_report(exp, portid, report);
3357         nf_ct_expect_put(exp);
3358 err_rcu:
3359         rcu_read_unlock();
3360 err_ct:
3361         nf_ct_put(ct);
3362         return err;
3363 }
3364
3365 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3366                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3367                                 const struct nlattr * const cda[],
3368                                 struct netlink_ext_ack *extack)
3369 {
3370         struct nf_conntrack_tuple tuple;
3371         struct nf_conntrack_expect *exp;
3372         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3373         u_int8_t u3 = nfmsg->nfgen_family;
3374         struct nf_conntrack_zone zone;
3375         int err;
3376
3377         if (!cda[CTA_EXPECT_TUPLE]
3378             || !cda[CTA_EXPECT_MASK]
3379             || !cda[CTA_EXPECT_MASTER])
3380                 return -EINVAL;
3381
3382         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3383         if (err < 0)
3384                 return err;
3385
3386         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3387                                     u3, NULL);
3388         if (err < 0)
3389                 return err;
3390
3391         spin_lock_bh(&nf_conntrack_expect_lock);
3392         exp = __nf_ct_expect_find(net, &zone, &tuple);
3393         if (!exp) {
3394                 spin_unlock_bh(&nf_conntrack_expect_lock);
3395                 err = -ENOENT;
3396                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3397                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3398                                                       NETLINK_CB(skb).portid,
3399                                                       nlmsg_report(nlh));
3400                 }
3401                 return err;
3402         }
3403
3404         err = -EEXIST;
3405         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3406                 err = ctnetlink_change_expect(exp, cda);
3407         spin_unlock_bh(&nf_conntrack_expect_lock);
3408
3409         return err;
3410 }
3411
3412 static int
3413 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3414                              const struct ip_conntrack_stat *st)
3415 {
3416         struct nlmsghdr *nlh;
3417         struct nfgenmsg *nfmsg;
3418         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3419
3420         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3421                               IPCTNL_MSG_EXP_GET_STATS_CPU);
3422         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3423         if (nlh == NULL)
3424                 goto nlmsg_failure;
3425
3426         nfmsg = nlmsg_data(nlh);
3427         nfmsg->nfgen_family = AF_UNSPEC;
3428         nfmsg->version      = NFNETLINK_V0;
3429         nfmsg->res_id       = htons(cpu);
3430
3431         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3432             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3433             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3434                 goto nla_put_failure;
3435
3436         nlmsg_end(skb, nlh);
3437         return skb->len;
3438
3439 nla_put_failure:
3440 nlmsg_failure:
3441         nlmsg_cancel(skb, nlh);
3442         return -1;
3443 }
3444
3445 static int
3446 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3447 {
3448         int cpu;
3449         struct net *net = sock_net(skb->sk);
3450
3451         if (cb->args[0] == nr_cpu_ids)
3452                 return 0;
3453
3454         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3455                 const struct ip_conntrack_stat *st;
3456
3457                 if (!cpu_possible(cpu))
3458                         continue;
3459
3460                 st = per_cpu_ptr(net->ct.stat, cpu);
3461                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3462                                                  cb->nlh->nlmsg_seq,
3463                                                  cpu, st) < 0)
3464                         break;
3465         }
3466         cb->args[0] = cpu;
3467
3468         return skb->len;
3469 }
3470
3471 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3472                                   struct sk_buff *skb,
3473                                   const struct nlmsghdr *nlh,
3474                                   const struct nlattr * const cda[],
3475                                   struct netlink_ext_ack *extack)
3476 {
3477         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3478                 struct netlink_dump_control c = {
3479                         .dump = ctnetlink_exp_stat_cpu_dump,
3480                 };
3481                 return netlink_dump_start(ctnl, skb, nlh, &c);
3482         }
3483
3484         return 0;
3485 }
3486
3487 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3488 static struct nf_ct_event_notifier ctnl_notifier = {
3489         .fcn = ctnetlink_conntrack_event,
3490 };
3491
3492 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3493         .fcn = ctnetlink_expect_event,
3494 };
3495 #endif
3496
3497 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3498         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3499                                             .attr_count = CTA_MAX,
3500                                             .policy = ct_nla_policy },
3501         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3502                                             .attr_count = CTA_MAX,
3503                                             .policy = ct_nla_policy },
3504         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3505                                             .attr_count = CTA_MAX,
3506                                             .policy = ct_nla_policy },
3507         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3508                                             .attr_count = CTA_MAX,
3509                                             .policy = ct_nla_policy },
3510         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3511         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3512         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3513         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3514 };
3515
3516 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3517         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3518                                             .attr_count = CTA_EXPECT_MAX,
3519                                             .policy = exp_nla_policy },
3520         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3521                                             .attr_count = CTA_EXPECT_MAX,
3522                                             .policy = exp_nla_policy },
3523         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3524                                             .attr_count = CTA_EXPECT_MAX,
3525                                             .policy = exp_nla_policy },
3526         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3527 };
3528
3529 static const struct nfnetlink_subsystem ctnl_subsys = {
3530         .name                           = "conntrack",
3531         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3532         .cb_count                       = IPCTNL_MSG_MAX,
3533         .cb                             = ctnl_cb,
3534 };
3535
3536 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3537         .name                           = "conntrack_expect",
3538         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3539         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3540         .cb                             = ctnl_exp_cb,
3541 };
3542
3543 MODULE_ALIAS("ip_conntrack_netlink");
3544 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3545 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3546
3547 static int __net_init ctnetlink_net_init(struct net *net)
3548 {
3549 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3550         int ret;
3551
3552         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3553         if (ret < 0) {
3554                 pr_err("ctnetlink_init: cannot register notifier.\n");
3555                 goto err_out;
3556         }
3557
3558         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3559         if (ret < 0) {
3560                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3561                 goto err_unreg_notifier;
3562         }
3563 #endif
3564         return 0;
3565
3566 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3567 err_unreg_notifier:
3568         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3569 err_out:
3570         return ret;
3571 #endif
3572 }
3573
3574 static void ctnetlink_net_exit(struct net *net)
3575 {
3576 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3577         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3578         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3579 #endif
3580 }
3581
3582 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3583 {
3584         struct net *net;
3585
3586         list_for_each_entry(net, net_exit_list, exit_list)
3587                 ctnetlink_net_exit(net);
3588
3589         /* wait for other cpus until they are done with ctnl_notifiers */
3590         synchronize_rcu();
3591 }
3592
3593 static struct pernet_operations ctnetlink_net_ops = {
3594         .init           = ctnetlink_net_init,
3595         .exit_batch     = ctnetlink_net_exit_batch,
3596 };
3597
3598 static int __init ctnetlink_init(void)
3599 {
3600         int ret;
3601
3602         ret = nfnetlink_subsys_register(&ctnl_subsys);
3603         if (ret < 0) {
3604                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3605                 goto err_out;
3606         }
3607
3608         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3609         if (ret < 0) {
3610                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3611                 goto err_unreg_subsys;
3612         }
3613
3614         ret = register_pernet_subsys(&ctnetlink_net_ops);
3615         if (ret < 0) {
3616                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3617                 goto err_unreg_exp_subsys;
3618         }
3619 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3620         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3621         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3622 #endif
3623         return 0;
3624
3625 err_unreg_exp_subsys:
3626         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3627 err_unreg_subsys:
3628         nfnetlink_subsys_unregister(&ctnl_subsys);
3629 err_out:
3630         return ret;
3631 }
3632
3633 static void __exit ctnetlink_exit(void)
3634 {
3635         unregister_pernet_subsys(&ctnetlink_net_ops);
3636         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3637         nfnetlink_subsys_unregister(&ctnl_subsys);
3638 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3639         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3640 #endif
3641         synchronize_rcu();
3642 }
3643
3644 module_init(ctnetlink_init);
3645 module_exit(ctnetlink_exit);